介绍了一种复合型图像加减滤波器，该元件是由Ｒｏｎｃｈｉ光栅和离轴Ｆｒｅｓｎｅｌ波带板复合而成，它的透射率函数是Ｒｏｎｃｎｉ光栅和Ｆｒｅｓｎｅｌ波带板两透射率函数的逻辑异或。用作图像加减时具有光路简单、调节方便、处理的面积大等优点。讨论了用这种滤波器作图像加减的原理，介绍了元件的制作方法．并给出了实验结果。 A composite image addition and subtraction filter is introduced, which is composed of Ronchi grating and off-axis Fresnel waveband plate. Its transmittance function is the logical exclusive OR of the two transmissivity functions of Roncni grating and Fresnel wave plate. . When used as image addition and subtraction has the advantages of simple optical path, easy adjustment, processing area and so on. Discusses the principle of using this filter for image addition and subtraction, and introduces the manufacturing method of components. The experimental results are given.